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Drummond Turnbull R, Bell NL. f-Block hydride complexes - synthesis, structure and reactivity. Dalton Trans 2024. [PMID: 38953848 DOI: 10.1039/d4dt00776j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/04/2024]
Abstract
Complexes formed between the heaviest and lightest elements in the periodic table yield the f-block hydrides, a unique class of compounds with wide-ranging utility and interest, from catalysis to light-responsive materials and nuclear waste storage. Recent developments in syntheses and analytics, such as exploiting low-oxidation state metal ions and improvements in X-ray diffraction tools, have transformed our ability to understand, access and manipulate these important species. This perspective brings together insights from binary metal hydrides, with molecular solution phase studies on heteroleptic complexes and gas phase investigations. It aims to provide an overview of how the f-element influences hydride formation, structure and reactivity including the sometimes-surprising power of co-ligands to tune their behaviour towards a variety of applications.
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Affiliation(s)
| | - Nicola L Bell
- School of Chemistry, University of Glasgow, Glasgow, UK, G12 8QQ.
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2
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Lastowski RJ, Yarranton JT, Zhu L, Vogiatzis KD, Girolami GS. Three-Center M-H-B Bonds Are Strong Field Interactions. Synthesis and Characterization of M(CH 2NMe 2BH 3) 3 Complexes of Titanium, Chromium, and Cobalt. J Am Chem Soc 2023; 145:23585-23599. [PMID: 37851538 DOI: 10.1021/jacs.3c07336] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2023]
Abstract
We describe new compounds of stoichiometry M(CH2NMe2BH3)3 (M = Ti, Cr, and Co), each of which contains three chelating boranatodimethylaminomethyl (BDAM) ligands. In all three compounds, the BDAM anion, which is isoelectronic and isostructural with the neopentyl group, is bound to the metal center at one end by a metal-carbon σ bond and at the other by one three-center M-H-B interaction. The crystal structures show that the d1 titanium(III) compound is trigonal prismatic (or eight-coordinate, if two longer-ranged M···H interactions with the BH3 groups are included), whereas the d3 chromium(III) compound and the d6 cobalt(III) compounds are both fac-octahedral. The Cr and Co compounds exhibit two rapid dynamic processes in solution: exchange between the Δ and Λ enantiomers and exchange of the terminal and bridging hydrogen atoms on boron. For the Co complex, the barrier for Δ/Λ exchange (ΔG⧧298 = 10.1 kcal mol-1) is significantly smaller than those seen in other octahedral cobalt(III) compounds; DFT calculations suggest that Bailar twist and dissociative pathways for Δ/Λ exchange are both possible mechanisms. The UV-vis absorption spectra of the cobalt(III) and chromium(III) species show that the ligand field splittings Δo caused by the M-H-B interactions are unexpectedly large, thus placing them high on the spectrochemical series (near ammonia and alkyl groups); their nephelauxetic effect is also large. The DFT calculations suggest that these properties of M-H-B interactions are in part a consequence of their three-center nature, which delocalizes electron density away from the metal center and reduces electron-electron repulsions.
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Affiliation(s)
- R Joseph Lastowski
- School of Chemical Sciences, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, Illinois 61801, United States
| | - Jonathan T Yarranton
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
| | - Lingyang Zhu
- School of Chemical Sciences, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, Illinois 61801, United States
| | | | - Gregory S Girolami
- School of Chemical Sciences, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, Illinois 61801, United States
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Pathak K, Mishra S, Nandi C, Saha S, Ghosh S. Synthesis and Chemistry of Dihydridoborate Group 7 Metal Complexes with Varied N,E-Chelated Ligands (E = O, NH, or S). Inorg Chem 2023; 62:160-169. [PMID: 36574500 DOI: 10.1021/acs.inorgchem.2c03095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Several dihydridoborate group 7 metal complexes have been synthesized and their structural aspects have been described from various N,S-, N,N-, and N,O-chelated borate species, such as Na[(H3B)mp] (mp = 2-mercaptopyridyl), Na[(H3B)amt] (amt = 2-amino-5-mercapto-1,3,4-thiadiazolyl), Na[(H3B)hp] (hp = 2-hydroxypyridyl), Na[(H2B)bap] (bap = bis(2-aminopyridyl)), and Na[(H2B)bdap] (bdap = bis(2,6-diaminopyridyl)). Room temperature photolysis of [M2(CO)10] (M = Mn or Re) with these borate species afforded dihydridoborate complexes [(CO)3M(μ-H)2BHL] 1-6 (1, M = Mn, L = mp; 2, M = Re, L = mp; 3, M = Mn, L = amt; 4, M = Mn, L = hp; 5, M = Mn, L = ap; 6, M = Mn, L = dap, ap = 2-aminopyridyl, dap = 2,6-diaminopyridyl). In complexes 1-3, the corresponding (H2BHL) units are coordinated to the metal centers through the (κ3-H,H,S) mode. However, in complexes 4 and 5 (or 6), the connection is via (κ3-H,H,O) and (κ3-H,H,N) modes of coordination, respectively. Complexes 1 and 5 underwent hydroboration reactions with terminal alkynes that yielded trans-hydroborated species [Mn(CO)3(μ-H)2(NC5H4E)B(PhC═CH2)] (7, E = S; 8, E = NH). Density functional theory (DFT) calculations have been carried out to investigate the electronic structures of these dihydridoborate species as well as the nature of bonding in them.
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Affiliation(s)
- Kriti Pathak
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India
| | - Shivankan Mishra
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India
| | - Chandan Nandi
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India
| | - Suvam Saha
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India
| | - Sundargopal Ghosh
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India
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Chang J, Ding M, Kang JX, Zhang J, Chen X. Coordination mode and stability of the tetrahydroborate ligand in group 10 metal pincer complexes. Dalton Trans 2022; 51:11507-11514. [PMID: 35833572 DOI: 10.1039/d2dt01357f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The coordination mode of the BH4- ligand in transition metal tetrahydroborate complexes is mainly dominated by the nature of the metal centres. However, other factors can also play important roles sometimes. In order to rationalize the coordination modes and the stability of the BH4- ligand in group 10 metal tetrahydroborate pincer complexes, [2,6-(tBu2PO)2C6H3]Pt(η1-HBH3) and [C6H4-o-(NCH2PtBu2)2B]M(η2-H2BH2) (M = Ni, Pt) were prepared and characterized. A structural comparison of [2,6-(tBu2PCH2)2C6H3]Ni(BH4), [2,6-(tBu2PO)2C6H3]M(BH4) and [C6H4-o-(NCH2PtBu2)2B]M(BH4) (M = Ni, Pd, and Pt) indicates that the M-P bond length, the P-M-P bite angle and the trans-influence of the central atom in the pincer platform also affect the coordination mode of the BH4- ligand. The nickel complexes tend to adopt a monodentate coordination mode while the palladium and platinum complexes can adopt either the monodentate or the bidentate mode depending on the structural features of the pincer platforms. Longer M-P bonds and smaller P-M-P bite angles favour the bidentate mode. The stability of the BH4- ligand is influenced by both the coordination mode and the nature of the metal centre. The BH3 species is released more easily from complexes with less electron rich metal centres. Following the series of Ni, Pd, and Pt, complexes with the same pincer ligand more easily lose a BH3 moiety.
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Affiliation(s)
- Jiarui Chang
- Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Collaborative Innovation Centre of Henan Province for Green Manufacturing of Fine Chemicals, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, China.
| | - Man Ding
- Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Collaborative Innovation Centre of Henan Province for Green Manufacturing of Fine Chemicals, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, China.
| | - Jia-Xin Kang
- Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Collaborative Innovation Centre of Henan Province for Green Manufacturing of Fine Chemicals, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, China.
| | - Jie Zhang
- Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Collaborative Innovation Centre of Henan Province for Green Manufacturing of Fine Chemicals, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, China.
| | - Xuenian Chen
- Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Collaborative Innovation Centre of Henan Province for Green Manufacturing of Fine Chemicals, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, China. .,College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, Henan 450001, China
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Lin L, Spasyuk DM, Lalancette RA, Prokopchuk DE. Coordination-Induced Weakening of a C(sp 3)-H Bond: Homolytic and Heterolytic Bond Strength of a CH-Ni Agostic Interaction. J Am Chem Soc 2022; 144:12632-12637. [PMID: 35786956 DOI: 10.1021/jacs.2c05667] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The scission of a C(sp3)-H bond to form a new metal-alkyl bond is a fundamental step in coordination chemistry and catalysis. However, the extent of C-H bond weakening when this moiety interacts with a transition metal is poorly understood and quantifying this phenomenon could provide insights into designing more efficient C-H functionalization catalysts. We present a nickel complex with a robust adamantyl reporter ligand that enables the measurement of C-H acidity (pKa) and bond dissociation free energy (BDFE) for a C(sp3)-H agostic interaction, showing a decrease in pKa by dozens of orders of magnitude and BDFE decrease of about 30 kcal/mol upon coordination. X-ray crystallographic data is provided for all molecules, including a distorted square planar NiIII metalloradical and "doubly agostic" NiII(κ2-CH2) complex.
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Affiliation(s)
- Lirong Lin
- Department of Chemistry, Rutgers University-Newark, 73 Warren Street, Newark, New Jersey 07102, United States
| | - Denis M Spasyuk
- Canadian Light Source, 44 Innovation Boulevard, Saskatoon, Saskatchewan S7N2V3, Canada
| | - Roger A Lalancette
- Department of Chemistry, Rutgers University-Newark, 73 Warren Street, Newark, New Jersey 07102, United States
| | - Demyan E Prokopchuk
- Department of Chemistry, Rutgers University-Newark, 73 Warren Street, Newark, New Jersey 07102, United States
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Bardonov DA, Komarov PD, Sadrtdinova GI, Besprozvannyh VK, Lyssenko KA, Gudovannyy AO, Nifant'ev IE, Minyaev ME, Roitershtein DM. Cyclopentadienyl lanthanide borohydrides derived from the unsubstituted cyclopentadienyl ligand. Unprecedented structural diversity and ε-caprolactone polymerization. Inorganica Chim Acta 2022. [DOI: 10.1016/j.ica.2021.120638] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Suárez-Alcántara K, Tena García JR. Metal Borohydrides beyond Groups I and II: A Review. MATERIALS 2021; 14:ma14102561. [PMID: 34069281 PMCID: PMC8156325 DOI: 10.3390/ma14102561] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/05/2021] [Revised: 05/08/2021] [Accepted: 05/08/2021] [Indexed: 11/28/2022]
Abstract
This review consists of a compilation of synthesis methods and several properties of borohydrides beyond Groups I and II, i.e., transition metals, main group, lanthanides, and actinides. The reported properties include crystal structure, decomposition temperature, ionic conductivity, photoluminescence, etc., when available. The compiled properties reflect the rich chemistry and possible borohydrides’ application in areas such as hydrogen storage, electronic devices that require an ionic conductor, catalysis, or photoluminescence. At the end of the review, two short but essential sections are included: a compilation of the decomposition temperature of all reported borohydrides versus the Pauling electronegativity of the cations, and a brief discussion of the possible reactions occurring during diborane emission, including some strategies to reduce this inconvenience, particularly for hydrogen storage purposes.
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Zhu W, Zhao J, Wang L, Teng YL, Dong BX. Mechanochemical reactions of alkali borohydride with CO2 under ambient temperature. J SOLID STATE CHEM 2019. [DOI: 10.1016/j.jssc.2019.07.037] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Adding to the Family of Copper Complexes Featuring Borohydride Ligands Based on 2-Mercaptopyridyl Units. INORGANICS 2019. [DOI: 10.3390/inorganics7080093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Borohydride ligands featuring multiple pendant donor functionalities have been prevalent in the chemical literature for many decades now. More recent times has seen their development into new families of so-called soft scorpionates, for example, those featuring sulfur based donors. Despite all of these developments, those ligands containing just one pendant group are rare. This article explores one ligand family based on the 2-mercaptopyridine heterocycle. The coordination chemistry of the monosubstituted ligand, [H3B(mp)]− (mp = 2-mercaptopyridyl), has been explored. Reaction of Na[BH3(mp)] with one equivalent of Cu(I)Cl in the presence of either triphenylphosphine or tricyclohexylphosphine co-ligands leads to the formation of [Cu{H3B(mp)}(PR3)] (R = Ph, 1; Cy, 2), respectively. Structural characterization confirms a κ3-S,H,H coordination mode for the borohydride-based ligand within 1 and 2, involving a dihydroborate bridging interaction (BH2Cu) with the copper centers.
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Safronov SV, Gutsul EI, Golub IE, Dolgushin FM, Nelubina YV, Filippov OA, Epstein LM, Peregudov AS, Belkova NV, Shubina ES. Synthesis, structural properties and reactivity of ruthenocene-based pincer Pd(ii) tetrahydroborate. Dalton Trans 2019; 48:12720-12729. [DOI: 10.1039/c9dt02176k] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Non-covalent interactions determine the structure, crystal packing and reactivity of isolated ruthenocene-based pincer Pd(ii) complexes. Bifurcate dihydrogen-bonded complexes are active intermediates of tetrahydroborate alcoholysis.
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Affiliation(s)
- Sergey V. Safronov
- A. N. Nesmeyanov Institute of Organoelement Compounds
- Russian Academy of Sciences (INEOS RAS)
- 119991 Moscow
- Russia
| | - Evgenii I. Gutsul
- A. N. Nesmeyanov Institute of Organoelement Compounds
- Russian Academy of Sciences (INEOS RAS)
- 119991 Moscow
- Russia
| | - Igor E. Golub
- A. N. Nesmeyanov Institute of Organoelement Compounds
- Russian Academy of Sciences (INEOS RAS)
- 119991 Moscow
- Russia
| | - Fedor M. Dolgushin
- A. N. Nesmeyanov Institute of Organoelement Compounds
- Russian Academy of Sciences (INEOS RAS)
- 119991 Moscow
- Russia
| | - Yulia V. Nelubina
- A. N. Nesmeyanov Institute of Organoelement Compounds
- Russian Academy of Sciences (INEOS RAS)
- 119991 Moscow
- Russia
| | - Oleg A. Filippov
- A. N. Nesmeyanov Institute of Organoelement Compounds
- Russian Academy of Sciences (INEOS RAS)
- 119991 Moscow
- Russia
| | - Lina M. Epstein
- A. N. Nesmeyanov Institute of Organoelement Compounds
- Russian Academy of Sciences (INEOS RAS)
- 119991 Moscow
- Russia
| | - Alexander S. Peregudov
- A. N. Nesmeyanov Institute of Organoelement Compounds
- Russian Academy of Sciences (INEOS RAS)
- 119991 Moscow
- Russia
| | - Natalia V. Belkova
- A. N. Nesmeyanov Institute of Organoelement Compounds
- Russian Academy of Sciences (INEOS RAS)
- 119991 Moscow
- Russia
| | - Elena S. Shubina
- A. N. Nesmeyanov Institute of Organoelement Compounds
- Russian Academy of Sciences (INEOS RAS)
- 119991 Moscow
- Russia
- Peoples’ Friendship University of Russia (RUDN University)
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Chen XM, Ma N, Zhang QF, Wang J, Feng X, Wei C, Wang LS, Zhang J, Chen X. Elucidation of the Formation Mechanisms of the Octahydrotriborate Anion (B 3H 8-) through the Nucleophilicity of the B-H Bond. J Am Chem Soc 2018; 140:6718-6726. [PMID: 29732884 DOI: 10.1021/jacs.8b03785] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Boron compounds are well-known electrophiles. Much less known are their nucleophilic properties. By recognition of the nucleophilicity of the B-H bond, the formation mechanism of octahydrotriborate (B3H8-) was elucidated on the bases of both experimental and computational investigations. Two possible routes from the reaction of BH4- and THF·BH3 to B3H8- were proposed, both involving the B2H6 and BH4- intermediates. The two pathways consist of a set of complicated intermediates, which can convert to each other reversibly at room temperature and can be represented by a reaction circle. Only under reflux can the B2H6 and BH4- intermediates be converted to B2H5- and BH3(H2) via a high energy barrier, from which H2 elimination occurs to yield the B3H8- final product. The formation of B2H6 from THF·BH3 by nucleophilic substitution of the B-H bond was captured and identified, and the reaction of B2H6 with BH4- to produce B3H8- was confirmed experimentally. On the bases of the formation mechanisms of B3H8-, we have developed a facile synthetic method for MB3H8 (M = Li and Na) in high yields by directly reacting the corresponding MBH4 salts with THF·BH3. In the new synthetic method for MB3H8, no electron carriers are needed, allowing convenient preparation of MB3H8 in large scales and paving the way for their wide applications.
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Affiliation(s)
- Xi-Meng Chen
- School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials , Henan Normal University , Xinxiang , Henan 453007 , China
| | - Nana Ma
- School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials , Henan Normal University , Xinxiang , Henan 453007 , China
| | - Qian-Fan Zhang
- Department of Chemistry , Brown University , Providence , Rhode Island 02912 , United States
| | - Jin Wang
- School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials , Henan Normal University , Xinxiang , Henan 453007 , China
| | - Xiaoge Feng
- School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials , Henan Normal University , Xinxiang , Henan 453007 , China
| | - Changgeng Wei
- School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials , Henan Normal University , Xinxiang , Henan 453007 , China
| | - Lai-Sheng Wang
- Department of Chemistry , Brown University , Providence , Rhode Island 02912 , United States
| | - Jie Zhang
- School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials , Henan Normal University , Xinxiang , Henan 453007 , China
| | - Xuenian Chen
- School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials , Henan Normal University , Xinxiang , Henan 453007 , China
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Al-Harbi A, Hammond MJ, Parkin G. Organometallic Zirconium Compounds in an Oxygen-Rich Coordination Environment: Synthesis and Structural Characterization of Tris(oxoimidazolyl)hydroboratozirconium Compounds. Inorg Chem 2018; 57:1426-1437. [PMID: 29314851 DOI: 10.1021/acs.inorgchem.7b02832] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A series of tris(oxoimidazolyl)hydroborato ligands, which serve as L2X [O3] donors, have been employed to obtain organometallic zirconium compounds in an uncommon oxygen-rich coordination environment. For example, Cp[ToMeBenz]ZrCl2 has been synthesized via the reaction of [ToMeBenz]Na with CpZrCl3 and bears a structural resemblance to the bent metallocene dichloride derivative Cp2ZrCl2. In addition, the half-sandwich counterparts [ToMeBenz]ZrCl3 and [ToBut]ZrCl3 have been obtained by metathesis of ZrCl4 with [ToMeBenz]Na and [ToBut]Na, respectively. The structurally related zirconium benzyl compounds [ToRBenz]Zr(CH2Ph)3 (R = Me, But, 1-Ad) have also been synthesized via the reactions of [ToRBenz]Tl with Zr(CH2Ph)4, and X-ray diffraction studies demonstrate that the benzyl ligands in these compounds are conformationally flexible and exhibit a large range of Zr-CH2-Ph bond angles (94.7-131.7°). Protolytic cleavage of one of the benzyl ligands of [ToRBenz]Zr(CH2Ph)3 (R = But, 1-Ad) may be achieved by treatment with [PhNHMe2][B(C6F5)4] to generate {[ToRBenz]Zr(CH2Ph)2}[B(C6F5)4], which are catalysts for the polymerization of ethylene. The molecular structure of the ether adduct, {[ToButBenz]Zr(CH2Ph)2(OEt2)}[B(C6F5)4], has been determined by X-ray diffraction. In addition to the use of tris(oxoimidazolyl)hydroborato ligands, bis(oxoimidazolyl)hydroborato ligands have also been used to obtain zirconium benzyl compounds in oxygen-rich environments, namely, [BoMeBenz]2Zr(CH2Ph)2 and [BoAdBenz]2Zr(CH2Ph)2.
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Affiliation(s)
- Ahmed Al-Harbi
- Department of Chemistry, Columbia University , New York, New York 10027, United States
| | - Matthew J Hammond
- Department of Chemistry, Columbia University , New York, New York 10027, United States
| | - Gerard Parkin
- Department of Chemistry, Columbia University , New York, New York 10027, United States
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Binuclear Copper(I) Borohydride Complex Containing Bridging Bis(diphenylphosphino) Methane Ligands: Polymorphic Structures of [(µ2-dppm)2Cu2(η2-BH4)2] Dichloromethane Solvate. CRYSTALS 2017. [DOI: 10.3390/cryst7100318] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Fadlallah S, Jothieswaran J, Capet F, Bonnet F, Visseaux M. Mixed Allyl Rare-Earth Borohydride Complexes: Synthesis, Structure, and Application in (Co-)Polymerization Catalysis of Cyclic Esters. Chemistry 2017; 23:15644-15654. [PMID: 28845893 DOI: 10.1002/chem.201702902] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2017] [Revised: 08/25/2017] [Indexed: 11/05/2022]
Abstract
A series of new trivalent rare-earth allyl-borohydride complexes with the formula [RE(BH4 )2 (C3 H5 )(thf)x ] (RE=Sc (1), x=2; RE=Y (2) and La (3), x=3) were synthesized by reaction of the corresponding rare-earth trisborohydrides [RE(BH4 )3 (thf)x ] with half an equivalent of bis(allyl)magnesium. The complexes were fully characterized by determining their X-ray structure. Similar to their previously described Nd (4) and Sm (5) analogues, these complexes display a monomeric structure with two terminal trihapto BH4 groups, one π-η3 allyl ligand, three THF molecules for complexes 2 and 3, and two THF molecules for complex 1. The catalytic behavior of complexes 1-5 toward the ring-opening polymerization (ROP) of l-lactide (l-LA) and ϵ-caprolactone (ϵ-CL) was assessed. The Nd complex featured the best activity toward l-LA (turnover frequency (TOF)=1300 h-1 ) and the order was Nd>La>Sm>Y>Sc. Complexes 1-3 were found very active for the ROP of ϵ-CL (TOF=166 000 h-1 ), which is in line with the already established exceptionnally high performance of complexes 4 and 5. With both monomers, it was shown that the borohydride moiety was the preferentially initiating group, rather than the allyl one. The random copolymerization of l-LA and ϵ-CL was performed with complexes 1-5, in the absence or in the presence of benzyl alcohol as a chain-transfer agent, affording copolymers with ϵ-caprolactone up to 62 % inserted. The copolymers synthesized display a variety of microstructures, that is, blocky, random, or quasi-alternating.
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Affiliation(s)
- Sami Fadlallah
- Univ. Lille, CNRS, Centrale Lille, ENSCL, Univ. Artois, UMR 8181-UCCS-Unité de Catalyse et Chimie du Solide, F-59000, Lille, France
| | - Jashvini Jothieswaran
- Univ. Lille, CNRS, Centrale Lille, ENSCL, Univ. Artois, UMR 8181-UCCS-Unité de Catalyse et Chimie du Solide, F-59000, Lille, France
| | - Frédéric Capet
- Univ. Lille, CNRS, Centrale Lille, ENSCL, Univ. Artois, UMR 8181-UCCS-Unité de Catalyse et Chimie du Solide, F-59000, Lille, France
| | - Fanny Bonnet
- Univ. Lille, CNRS, Centrale Lille, ENSCL, Univ. Artois, UMR 8181-UCCS-Unité de Catalyse et Chimie du Solide, F-59000, Lille, France
| | - Marc Visseaux
- Univ. Lille, CNRS, Centrale Lille, ENSCL, Univ. Artois, UMR 8181-UCCS-Unité de Catalyse et Chimie du Solide, F-59000, Lille, France
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15
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Recent advances in the chemistry of tris(thiolato) bridged cyclopentadienyl dimolybdenum complexes. Coord Chem Rev 2017. [DOI: 10.1016/j.ccr.2016.10.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Kruse CP, Deb T, Aboelenen AM, Anderson CM, Petersen JL, Jensen MP. Variable Borohydride Hapticity in Nickel(II) Scorpionate Complexes [(TpR,Me)Ni(ηn‐BH4)]: TpR,Me = hydrotris{3‐R‐5‐methyl‐1‐pyrazolyl}borate; R = Ph, n = 3 vs. R = Me, n = 4. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201501330] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Colin P. Kruse
- Department of Chemistry and Biochemistry Ohio University 45701 Athens Ohio USA
| | - Tapash Deb
- Department of Chemistry and Biochemistry Ohio University 45701 Athens Ohio USA
| | - Ahmed M. Aboelenen
- Department of Chemistry and Biochemistry Ohio University 45701 Athens Ohio USA
| | - Caitlin M. Anderson
- Department of Chemistry and Biochemistry Ohio University 45701 Athens Ohio USA
| | - Jeffrey L. Petersen
- C. Eugene Bennett Department of Chemistry West Virginia University 26506 Morgantown West Virginia USA
| | - Michael P. Jensen
- Department of Chemistry and Biochemistry Ohio University 45701 Athens Ohio USA
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17
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The Covalent Bond Classification Method and Its Application to Compounds That Feature 3-Center 2-Electron Bonds. THE CHEMICAL BOND III 2016. [DOI: 10.1007/430_2015_206] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Sawatlon B, Surawatanawong P. Mechanisms for dehydrogenation and hydrogenation of N-heterocycles using PNP-pincer-supported iron catalysts: a density functional study. Dalton Trans 2016; 45:14965-78. [DOI: 10.1039/c6dt02431a] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The bifunctionality of Fe-PNP plays a role in stabilizing the ion-pair complex in the dehydrogenation via a hydrogen bonding and a C–H agostic interaction.
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Affiliation(s)
- Boodsarin Sawatlon
- Department of Chemistry and Center of Excellence for Innovation in Chemistry
- Faculty of Science
- Mahidol University
- Bangkok 10400
- Thailand
| | - Panida Surawatanawong
- Department of Chemistry and Center of Excellence for Innovation in Chemistry
- Faculty of Science
- Mahidol University
- Bangkok 10400
- Thailand
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Murugesan S, Stöger B, Weil M, Veiros LF, Kirchner K. Synthesis, Structure, and Reactivity of Co(II) and Ni(II) PCP Pincer Borohydride Complexes. Organometallics 2015; 34:1364-1372. [PMID: 27642212 PMCID: PMC5021384 DOI: 10.1021/acs.organomet.5b00075] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2015] [Indexed: 11/28/2022]
Abstract
The 15e square-planar complexes [Co(PCPMe-iPr)Cl] (2a) and [Co(PCP-tBu)Cl] (2b), respectively, react readily with NaBH4 to afford complexes [Co(PCPMe-iPr)(η2-BH4)] (4a) and [Co(PCP-tBu)(η2-BH4)] (4b) in high yields, as confirmed by IR spectroscopy, X-ray crystallography, and elemental analysis. The borohydride ligand is symmetrically bound to the cobalt center in η2-fashion. These compounds are paramagnetic with effective magnetic moments of 2.0(1) and 2.1(1) μB consistent with a d7 low-spin system corresponding to one unpaired electron. None of these complexes reacted with CO2 to give formate complexes. For structural and reactivity comparisons, we prepared the analogous Ni(II) borohydride complex [Ni(PCPMe-iPr)(η2-BH4)] (5) via two different synthetic routes. One utilizes [Ni(PCPMe-iPr)Cl] (3) and NaBH4, the second one makes use of the hydride complex [Ni(PCPMe-iPr)H] (6) and BH3·THF. In both cases, 5 is obtained in high yields. In contrast to 4a and 4b, the borohydride ligand is asymmetrically bound to the nickel center but still in an η2-mode. [Ni(PCPMe-iPr)(η2-BH4)] (5) loses readily BH3 at elevated temperatures in the presence of NEt3 to form 6. Complexes 5 and 6 are both diamagnetic and were characterized by a combination of 1H, 13C{1H}, and 31P{1H} NMR, IR spectroscopy, and elemental analysis. Additionally, the structure of these compounds was established by X-ray crystallography. Complexes 5 and 6 react with CO2 to give the formate complex [Ni(PCPMe-iPr)(OC(C=O)H] (7). The extrusion of BH3 from [Co(PCPMe-iPr)(η2-BH4)] (4a) and [Ni(PCPMe-iPr)(η2-BH4)] (5) with the aid of NH3 to yield the respective hydride complexes [Co(PCPMe-iPr)H] and [Ni(PCPMe-iPr)H] (6) and BH3NH3 was investigated by DFT calculations showing that formation of the Ni hydride is thermodynamically favorable, whereas the formation of the Co(II) hydride, in agreement with the experiment, is unfavorable. The electronic structures and the bonding of the borohydride ligand in [Co(PCPMe-iPr)(η2-BH4)] (4a) and [Ni(PCPMe-iPr)(η2-BH4)] (5) were established by DFT computations.
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Affiliation(s)
- Sathiyamoorthy Murugesan
- Institute of Applied Synthetic Chemistry and Institute of Chemical Technologies
and Analytics, Vienna University of Technology, Getreidemarkt 9, A-1060 Vienna, Austria
| | - Berthold Stöger
- Institute of Applied Synthetic Chemistry and Institute of Chemical Technologies
and Analytics, Vienna University of Technology, Getreidemarkt 9, A-1060 Vienna, Austria
| | - Matthias Weil
- Institute of Applied Synthetic Chemistry and Institute of Chemical Technologies
and Analytics, Vienna University of Technology, Getreidemarkt 9, A-1060 Vienna, Austria
| | - Luis F. Veiros
- Centro
de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais No. 1, 1049-001 Lisboa, Portugal
| | - Karl Kirchner
- Institute of Applied Synthetic Chemistry and Institute of Chemical Technologies
and Analytics, Vienna University of Technology, Getreidemarkt 9, A-1060 Vienna, Austria
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Koehne I, Schmeier TJ, Bielinski EA, Pan CJ, Lagaditis PO, Bernskoetter WH, Takase MK, Würtele C, Hazari N, Schneider S. Synthesis and Structure of Six-Coordinate Iron Borohydride Complexes Supported by PNP Ligands. Inorg Chem 2014; 53:2133-43. [DOI: 10.1021/ic402762v] [Citation(s) in RCA: 85] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Ingo Koehne
- Institut
für Anorganische Chemie, Georg-August-Universität Göttingen, Tammannstrasse
4, 37077 Göttingen, Germany
| | - Timothy J. Schmeier
- Department
of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520, United States
| | - Elizabeth A. Bielinski
- Department
of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520, United States
| | - Cassie J. Pan
- Department
of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520, United States
| | - Paraskevi O. Lagaditis
- Institut
für Anorganische Chemie, Georg-August-Universität Göttingen, Tammannstrasse
4, 37077 Göttingen, Germany
| | - Wesley H. Bernskoetter
- Department
of Chemistry, Brown University, Providence, Rhode Island 02912, United States
| | - Michael K. Takase
- Department
of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520, United States
| | - Christian Würtele
- Institut
für Anorganische Chemie, Georg-August-Universität Göttingen, Tammannstrasse
4, 37077 Göttingen, Germany
| | - Nilay Hazari
- Department
of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520, United States
| | - Sven Schneider
- Institut
für Anorganische Chemie, Georg-August-Universität Göttingen, Tammannstrasse
4, 37077 Göttingen, Germany
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21
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Catalytic Behavior of Rare-Earth Borohydride Complexes in Polymerization of Polar Monomers. ACTA ACUST UNITED AC 2014. [DOI: 10.1016/b978-0-444-62711-7.00259-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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2,5-Bis{N-(2,6-diisopropylphenyl)iminomethyl}pyrrolyl borohydride complexes of the divalent lanthanides – Synthesis, structures and ring-opening polymerization of ε-caprolactone. J Organomet Chem 2013. [DOI: 10.1016/j.jorganchem.2013.04.052] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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24
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Maekawa M, Daniliuc CG, Jones PG, Hohenberger J, Sutter J, Meyer K, Walter MD. Synthesis of [Cp′Fe(η3-BH4)] and Its Conversion to [Cp′FeBH2]3. Eur J Inorg Chem 2013. [DOI: 10.1002/ejic.201300168] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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25
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Kratsch J, Kuzdrowska M, Schmid M, Kazeminejad N, Kaub C, Oña-Burgos P, Guillaume SM, Roesky PW. Chiral Rare Earth Borohydride Complexes Supported by Amidinate Ligands: Synthesis, Structure, and Catalytic Activity in the Ring-Opening Polymerization of rac-Lactide. Organometallics 2013. [DOI: 10.1021/om301011v] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Jochen Kratsch
- Institut für Anorganische Chemie, Karlsruher Institut für Technologie (KIT), Engesserstrasse
15, 76131 Karlsruhe, Germany
| | - Magdalena Kuzdrowska
- Institut für Anorganische Chemie, Karlsruher Institut für Technologie (KIT), Engesserstrasse
15, 76131 Karlsruhe, Germany
| | - Matthias Schmid
- Institut für Anorganische Chemie, Karlsruher Institut für Technologie (KIT), Engesserstrasse
15, 76131 Karlsruhe, Germany
| | - Neda Kazeminejad
- Institut für Anorganische Chemie, Karlsruher Institut für Technologie (KIT), Engesserstrasse
15, 76131 Karlsruhe, Germany
| | - Christoph Kaub
- Institut für Anorganische Chemie, Karlsruher Institut für Technologie (KIT), Engesserstrasse
15, 76131 Karlsruhe, Germany
| | - Pascual Oña-Burgos
- Institut für Anorganische Chemie, Karlsruher Institut für Technologie (KIT), Engesserstrasse
15, 76131 Karlsruhe, Germany
| | - Sophie M. Guillaume
- Organometallics: Materials and Catalysis, Institut des Sciences Chimiques
de Rennes, CNRS−Université de Rennes 1 (UMR 6226), Campus de Beaulieu, 35042 Rennes Cedex, France
| | - Peter W. Roesky
- Institut für Anorganische Chemie, Karlsruher Institut für Technologie (KIT), Engesserstrasse
15, 76131 Karlsruhe, Germany
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Polymerization of ɛ-caprolactone by lanthanide trisborohydrides and crystal structure of [Ce(BH4)2(THF)5][Ce(BH4)4(THF)2]. J RARE EARTH 2012. [DOI: 10.1016/s1002-0721(12)60124-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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27
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Golub IE, Filippov OA, Gutsul EI, Belkova NV, Epstein LM, Rossin A, Peruzzini M, Shubina ES. Dimerization Mechanism of Bis(triphenylphosphine)copper(I) Tetrahydroborate: Proton Transfer via a Dihydrogen Bond. Inorg Chem 2012; 51:6486-97. [DOI: 10.1021/ic202598c] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Igor E. Golub
- A. N. Nesmeyanov
Institute of Organoelement Compounds, Russian Academy of Sciences (INEOS RAS), 28 Vavilov Street,
119991 Moscow, Russia
| | - Oleg A. Filippov
- A. N. Nesmeyanov
Institute of Organoelement Compounds, Russian Academy of Sciences (INEOS RAS), 28 Vavilov Street,
119991 Moscow, Russia
| | - Evgenii I. Gutsul
- A. N. Nesmeyanov
Institute of Organoelement Compounds, Russian Academy of Sciences (INEOS RAS), 28 Vavilov Street,
119991 Moscow, Russia
| | - Natalia V. Belkova
- A. N. Nesmeyanov
Institute of Organoelement Compounds, Russian Academy of Sciences (INEOS RAS), 28 Vavilov Street,
119991 Moscow, Russia
| | - Lina M. Epstein
- A. N. Nesmeyanov
Institute of Organoelement Compounds, Russian Academy of Sciences (INEOS RAS), 28 Vavilov Street,
119991 Moscow, Russia
| | - Andrea Rossin
- Istituto di Chimica dei Composti Organometallici Consiglio Nazionale delle Ricerche (ICCOM CNR), via Madonna del Piano 10, 50019 Sesto Fiorentino
(Florence), Italy
| | - Maurizio Peruzzini
- Istituto di Chimica dei Composti Organometallici Consiglio Nazionale delle Ricerche (ICCOM CNR), via Madonna del Piano 10, 50019 Sesto Fiorentino
(Florence), Italy
| | - Elena S. Shubina
- A. N. Nesmeyanov
Institute of Organoelement Compounds, Russian Academy of Sciences (INEOS RAS), 28 Vavilov Street,
119991 Moscow, Russia
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Langer R, Iron MA, Konstantinovski L, Diskin-Posner Y, Leitus G, Ben-David Y, Milstein D. Iron Borohydride Pincer Complexes for the Efficient Hydrogenation of Ketones under Mild, Base-Free Conditions: Synthesis and Mechanistic Insight. Chemistry 2012; 18:7196-209. [DOI: 10.1002/chem.201200159] [Citation(s) in RCA: 176] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2012] [Indexed: 11/05/2022]
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Desrochers PJ, Sutton CA, Abrams ML, Ye S, Neese F, Telser J, Ozarowski A, Krzystek J. Electronic Structure of Nickel(II) and Zinc(II) Borohydrides from Spectroscopic Measurements and Computational Modeling. Inorg Chem 2012; 51:2793-805. [DOI: 10.1021/ic201775c] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Patrick J. Desrochers
- Department of Chemistry, University of Central Arkansas, Conway, Arkansas 72035,
United States
| | - Christopher A. Sutton
- Department of Chemistry, University of Central Arkansas, Conway, Arkansas 72035,
United States
| | | | - Shengfa Ye
- Max-Planck Institute for Bioinorganic Chemistry, Stiftstrasse 34-36, D-45470
Mülheim an der Ruhr, Germany
| | - Frank Neese
- Max-Planck Institute for Bioinorganic Chemistry, Stiftstrasse 34-36, D-45470
Mülheim an der Ruhr, Germany
| | - Joshua Telser
- Department of Biological, Chemical
and Physical Sciences, Roosevelt University, Chicago, Illinois 60605, United States
| | - Andrew Ozarowski
- National High Magnetic Field
Laboratory, Florida State University, Tallahassee,
Florida 32310, United States
| | - J. Krzystek
- National High Magnetic Field
Laboratory, Florida State University, Tallahassee,
Florida 32310, United States
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30
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Green JC, Green MLH, Parkin G. The occurrence and representation of three-centre two-electron bonds in covalent inorganic compounds. Chem Commun (Camb) 2012; 48:11481-503. [DOI: 10.1039/c2cc35304k] [Citation(s) in RCA: 222] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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31
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Ha SI, Song MA, Park DY, Kang AS, Moon SB, Chung JH. Synthesis and Structural Characterization of Novel Anionic Thulium(III) Cyclic Organohydroborate Complex with Agostic Interactions {K(η 6-C 6H 5Me) 2}{Tm[(μ-H) 2(BC 8H 14)] 4}. B KOREAN CHEM SOC 2011. [DOI: 10.5012/bkcs.2011.32.10.3790] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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32
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Hesp KD, Kannemann FO, Rankin MA, McDonald R, Ferguson MJ, Stradiotto M. Probing mesitylborane and mesitylborate ligation within the coordination sphere of Cp*Ru(P(i)Pr3)+: a combined synthetic, X-ray crystallographic, and computational study. Inorg Chem 2011; 50:2431-44. [PMID: 21314172 DOI: 10.1021/ic1022328] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The reaction of Cp*Ru(P(i)Pr(3))Cl (1) with MesBH(2) (Mes = 2,4,6-trimethylphenyl) afforded the mesitylborate complex Cp*Ru(P(i)Pr(3))(BH(2)MesCl) (2, 66%). Exposure of 2 to the chloride abstracting agent LiB(C(6)F(5))(4)·2.5OEt(2) provided [Cp*Ru(P(i)Pr(3))(BH(2)Mes)](+)B(C(6)F(5))(4)(-) (3, 54%), which features an unusual η(2)-B-H monoborane ligand. The related borate complex Cp*Ru(P(i)Pr(3))(BH(3)Mes) (5, 65%) was prepared from 1 and LiH(3)BMes. Attempts to effect the insertion of unsaturated organic substrates into the B-H bonds of 3 were unsuccessful, and efforts to dehydrohalogenate 2 using KO(t)Bu instead afforded the mesitylborate complex Cp*(P(i)Pr(3))Ru(BH(2)MesOH) (6, 48%). Treatment of 1 with benzyl potassium generated an intermediate hydridoruthenium complex (7) resulting from dehydrogenation of a P(i)Pr fragment, which in turn was observed to react with MesBH(2) to afford the mesitylborate complex Cp*(P((i)Pr)(2)(CH(3)CCH(2)))Ru(BH(3)Mes) (8, 47%). Crystallographic characterization data are provided for 2, 3, 5, 6, and 8. A combined X-ray crystallographic and density functional theory (DFT) investigation of 3 and 5, using Natural Bond Orbital (NBO) and Atoms in Molecules (AIM) analysis, revealed that 3 and 5 are best described as donor-acceptor complexes between a Cp*(P(i)Pr(3))Ru(+) fragment and a bis(η(2)-B-H) coordinating mesitylborane(borate) ligand. Significant σ-donation from the B-H bonds into the Ru(II) center exists as evidenced by the NBO populations, bond orders, and AIM delocalization indices. In the case of 3, the vacant p orbital on boron is stabilized by Ru→B π back-donation as well as by resonance with the mesityl group.
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Affiliation(s)
- Kevin D Hesp
- Department of Chemistry, Dalhousie University, Halifax, Nova Scotia B3H 4J3, Canada
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Cushion MG, Mountford P. Cationic and charge-neutral calcium tetrahydroborate complexes and their use in the controlled ring-opening polymerisation of rac-lactide. Chem Commun (Camb) 2011; 47:2276-8. [DOI: 10.1039/c0cc04348f] [Citation(s) in RCA: 128] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Sirsch P, Clark NLN, Onuţ L, Burchell RPL, Decken A, McGrady GS, Daoud-Aladine A, Gutmann MJ. Insights into Metal Borohydride and Aluminohydride Bonding: X-Ray and Neutron Diffraction Structures and a DFT and Charge Density Study of [Na(15-crown-5)][EH4] (E = B, Al). Inorg Chem 2010; 49:11395-402. [DOI: 10.1021/ic1014187] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Peter Sirsch
- Department of Chemistry, University of New Brunswick, Fredericton, New Brunswick, Canada E3B 5A3
| | - Natascha L. N. Clark
- Department of Chemistry, University of New Brunswick, Fredericton, New Brunswick, Canada E3B 5A3
| | - Lenuţa Onuţ
- Department of Chemistry, University of New Brunswick, Fredericton, New Brunswick, Canada E3B 5A3
| | - Richard P. L. Burchell
- Department of Chemistry, University of New Brunswick, Fredericton, New Brunswick, Canada E3B 5A3
| | - Andreas Decken
- Department of Chemistry, University of New Brunswick, Fredericton, New Brunswick, Canada E3B 5A3
| | - G. Sean McGrady
- Department of Chemistry, University of New Brunswick, Fredericton, New Brunswick, Canada E3B 5A3
| | - Aziz Daoud-Aladine
- ISIS Neutron Facility, CCLRC Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, UK
| | - Matthias J. Gutmann
- ISIS Neutron Facility, CCLRC Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, UK
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Jenter J, Roesky P, Ajellal N, Guillaume S, Susperregui N, Maron L. Bis(phosphinimino)methanide Borohydride Complexes of the Rare-Earth Elements as Initiators for the Ring-Opening Polymerization of ε-Caprolactone: Combined Experimental and Computational Investigations. Chemistry 2010; 16:4629-38. [DOI: 10.1002/chem.200903107] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2009] [Indexed: 11/07/2022]
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Daly S, Piccoli P, Schultz A, Todorova T, Gagliardi L, Girolami G. Synthesis and Properties of a Fifteen-Coordinate Complex: The Thorium Aminodiboranate [Th(H3BNMe2BH3)4]. Angew Chem Int Ed Engl 2010; 49:3379-81. [DOI: 10.1002/anie.200905797] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Daly S, Piccoli P, Schultz A, Todorova T, Gagliardi L, Girolami G. Synthesis and Properties of a Fifteen-Coordinate Complex: The Thorium Aminodiboranate [Th(H3BNMe2BH3)4]. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.200905797] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Arliguie T, Belkhiri L, Bouaoud SE, Thuéry P, Villiers C, Boucekkine A, Ephritikhine M. Lanthanide(III) and actinide(III) complexes [M(BH4)2 (THF)5][BPh4] and [M(BH4)2(18-crown-6)][BPh4] (M = Nd, Ce, U): synthesis, crystal structure, and density functional theory investigation of the covalent contribution to metal-borohydride bonding. Inorg Chem 2009; 48:221-30. [PMID: 19053334 DOI: 10.1021/ic801685v] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Treatment of [M(BH4)3(THF)3] with NEt3HBPh4 in THF afforded the cationic complexes [M(BH4)2(THF)5][BPh4] [M = U (1), Nd (2), Ce (3)] which were transformed into [M(BH4)2(18-crown-6)][BPh4] [M = U (4), Nd (5), Ce (6)] in the presence of 18-crown-6; [U(BH4)2(18-thiacrown-6)][BPh4] (7) was obtained from 1 and 18-thiacrown-6 in tetrahydro-thiophene. Compounds 1, 3.C4H8S, 4.THF, 5, and 6.THF exhibit a penta- or hexagonal bipyramidal crystal structure with the two terdentate borohydride ligands in apical positions; the BH4 groups in the crystals of 7.C4H8S are in relative cis positions, and the thiacrown-ether presents a saddle shape, with two diametrically opposite sulfur atoms bound to uranium in trans positions. The crystal structures of these complexes, as well as those of previously reported [M(BH4)2(THF)5]+ cations, do not reveal any clear-cut lanthanide(III)/actinide(III) differentiation. The structural data obtained for [M(BH4)2(18-crown-6)]+ (M = U, Ce) by relativistic density functional theory (DFT) calculations are indicative of a small shortening of the U...B with respect to the Ce...B distance, which is accompanied by a lengthening of the U-Hb bonds and an opening of the Hb-B-Hb angle (Hb = bridging hydrogen atom of the eta3-BH4 ligand). The Mulliken population analysis and the natural bond orbital analysis indicate that the BH4 -->M(III) donation is greater for M = U than for M = Ce, as well as the overlap population of the M-Hb bond, thus showing a better interaction between the uranium 5f orbitals and the Hb atoms. The more covalent character of the B-H-U three-center two-electron bond was confirmed by the molecular orbital (MO) analysis. Three MOs represent the pi bonding interactions between U(III) and the three Hb atoms with significant 6d and 5f orbital contributions. These MOs in the cerium(III) complex exhibit a much lesser metallic weight with practically no participation of the 4f orbitals.
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Affiliation(s)
- Thérèse Arliguie
- CEA, IRAMIS, Service de Chimie Moléculaire, CNRS URA 331, CEA/Saclay, 91191 Gif-sur-Yvette, France
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Barros N, Mountford P, Guillaume S, Maron L. A DFT Study of the Mechanism of Polymerization of ɛ-Caprolactone Initiated by Organolanthanide Borohydride Complexes. Chemistry 2008; 14:5507-18. [DOI: 10.1002/chem.200800377] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Khalimon AY, Holland JP, Kowalczyk RM, McInnes EJL, Green JC, Mountford P, Nikonov GI. Synthesis and Molecular and Electronic Structure of an Unusual Paramagnetic Borohydride Complex Mo(NAr)2(PMe3)2(η2-BH4). Inorg Chem 2008; 47:999-1006. [DOI: 10.1021/ic701826v] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Andrey Y. Khalimon
- Chemistry Department, Brock University, Glenridge Ave. 500, St Catharines, ON L2S3A1, Canada, Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QR, U.K., and EPSRC c. w. EPR Service Centre, School of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Jason P. Holland
- Chemistry Department, Brock University, Glenridge Ave. 500, St Catharines, ON L2S3A1, Canada, Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QR, U.K., and EPSRC c. w. EPR Service Centre, School of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Radoslaw M. Kowalczyk
- Chemistry Department, Brock University, Glenridge Ave. 500, St Catharines, ON L2S3A1, Canada, Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QR, U.K., and EPSRC c. w. EPR Service Centre, School of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Eric J. L. McInnes
- Chemistry Department, Brock University, Glenridge Ave. 500, St Catharines, ON L2S3A1, Canada, Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QR, U.K., and EPSRC c. w. EPR Service Centre, School of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Jennifer C. Green
- Chemistry Department, Brock University, Glenridge Ave. 500, St Catharines, ON L2S3A1, Canada, Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QR, U.K., and EPSRC c. w. EPR Service Centre, School of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Philip Mountford
- Chemistry Department, Brock University, Glenridge Ave. 500, St Catharines, ON L2S3A1, Canada, Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QR, U.K., and EPSRC c. w. EPR Service Centre, School of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Georgii I. Nikonov
- Chemistry Department, Brock University, Glenridge Ave. 500, St Catharines, ON L2S3A1, Canada, Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QR, U.K., and EPSRC c. w. EPR Service Centre, School of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K
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Coordination Modes and Hydride Exchange Dynamics in Transition Metal Tetrahydroborate Complexes. STRUCTURE AND BONDING 2007. [DOI: 10.1007/430_2007_076] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/07/2022]
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Galvez-Ruiz JC, Sanchez M. Towards an understanding of the structure and bonding of lithium tetrahydroborate and its amine complexes. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/j.theochem.2007.04.036] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Preparation and crystal structures of an ionic triple-hydrogen-bridged derivative of 9-BBN hydroborate zirconium(IV). J Organomet Chem 2007. [DOI: 10.1016/j.jorganchem.2007.01.034] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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46
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Mehn MP, Brown SD, Paine TK, Brennessel WW, Cramer CJ, Peters JC, Que L. High-spin and low-spin iron(ii) complexes with facially-coordinated borohydride ligands. Dalton Trans 2006:1347-51. [PMID: 16505914 DOI: 10.1039/b509580h] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Rare examples of monometallic high-spin and low-spin L3Fe(H3BH) complexes have been characterized, where the two L3 ligands are [TpPh2] and [PhBP3] ([TpPh2] = [HB(3,5-Ph2pz)3]- and [PhBP3] = [PhB(CH2PPh2)3]-). The structures are reported wherein the borohydride ligand is facially coordinated to the iron center in each complex. Density functional methods have been employed to explain the bonding in these unusual iron(II) centers. Despite the differences in spin states, short Fe-B distances are observed in both complexes and there is significant theoretical evidence to support a substantial bonding interaction between the iron and boron nuclei. In light of this interaction, we suggest that these complexes can be described as (L3)Fe(eta4-H3BH) complexes.
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Affiliation(s)
- Mark P Mehn
- Department of Chemistry, Center for Metals in Biocatalysis, University of Minnesota, Minneapolis, Minnesota 55455, USA
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Synthesis and Molecular Structure of Novel Cyclic Organohydroborate Hafnocene Complex (η 5-C 5H 5) 2Hf{(μ-H) 2BC 8H 14\} 2. B KOREAN CHEM SOC 2005. [DOI: 10.5012/bkcs.2005.26.9.1447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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48
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Synthesis and Molecular Structure of Novel Organohydroborate Zirconocene Complex [(η 5-C 5H 5) 2Zr(μ-H)(μ-O)(BC 8H 14)] 2. B KOREAN CHEM SOC 2005. [DOI: 10.5012/bkcs.2005.26.5.707] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Ariafard A, Amini MM, Azadmehr A. Density functional theory study on structural isomers and bonding of model complexes M(CO)5(BH3·PH3) (M=Cr, Mo, W) and W(CO)5(BH3·AH3) (A=N, P, As, Sb). J Organomet Chem 2005. [DOI: 10.1016/j.jorganchem.2004.11.021] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2022]
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Theoretical study on interaction of different coordination modes of BH4 ligand with transition metal in [TM(BH4)(CO)4]− (TM=Cr, Mo). J Organomet Chem 2005. [DOI: 10.1016/j.jorganchem.2004.08.034] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2022]
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